"Library of Ruina" is a tactical role-playing game developed by Project Moon, set in the same universe as its predecessor, "Lobotomy Corporation." The game revolves around a mysterious library that collects books which contain the stories of various characters, known as " Guests." Players take on the role of the Librarian, who manages this enigmatic establishment and engages in strategic card-based battles against the Guests who come seeking knowledge or power.
The gameplay combines elements of deck-building and tactical combat, where players construct decks of cards representing various actions, abilities, and characters that can be summoned during battles. Each encounter is a unique experience influenced by the narrative choices made throughout the game, interweaving gameplay with a captivating storyline that unravels the dark mysteries of the library and its inhabitants. As characters engage in combat, they can be upgraded and customized, leading to diverse builds that encourage experimentation. The art style is distinctive, featuring a blend of stunning visuals, and the sound design complements the atmosphere, enhancing the overall immersion into this haunting yet compelling world.